I would have thought this. But apparently quite a significant percentage of people don’t really care when they discover its not really true. Instead they make up explanations why its probably not a “lie” but something more relatable. I have to admit I was one of these people, although I am not entirely sure why.
Here’s a similar story:
Someone I know, not celeb, always claims to be “half Scottish half French” when they introducer themselves. They do an imperfect but ok-ish impression of the Scottish accent mixed with lots of French influence, and the occasional grammar mistake.
For the longest time we had assumed that half Scottish half French means: one parent Scottish, the other French. Easy.
After several errors that a native speaker wouldn’t do I asked which parent is Scottish. After many questions and a long conversation I learned that both parents are French. And the person grew up in France. Had some trips (with very fond memories) to Scotland, so feels emotionally close, but has no blood-relatives who are actually Scottish, only some close family friends.
So the explanation for “half Scottish” then was, “I don’t want to say the whole story but I want to express that I feel connected to the country”. So much so tgat they are no longer using their French first name but made up a more Scottish sounding one and asks everyone to call them by that name.
I have to admit, for quite a long time, though I did know that I had originally not been told the truth I didn’t mind too much. Because it “made sense”, I guess but I can’t really explain why.
Only quite a bit later when on one occasion I found out that thiey don’t even have British citizenship, did I start thinking that this whole Scottish story is quite odd and what else is not true about them…
Most people just happily call them by the Scottish name even if they know it’s made up. I find it all very confusing how accepting I was of the fact that I (and many others) “misunderstood” how they meant “half”, even though making up a persona with a whole different nationality is really odd.